/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundFrontendGraphLinter.h
Returns true if the FromNode can reach the ToNode by traversing the graph backwards (aka by traversing the transpose graph).
static bool IsReachableUpstream ( const [INodeController](API\Plugins\MetasoundFrontend\INodeController) & InFromNode, const [INodeController](API\Plugins\MetasoundFrontend\INodeController) & InToNode )